:root{--pri:#2f5fe0;--pri-d:#1a3aa8;--acc:#e8a33d;--bg:#f4f6fb;--card:#ffffff;--tx:#1f2433;--tx2:#68708a;--bd:#e2e7f3;--danger:#c0392b}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:"PingFang SC","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--tx);font-size:15px;line-height:1.6}
.app{max-width:520px;margin:0 auto;min-height:100vh;background:var(--bg);display:flex;flex-direction:column}
header{position:sticky;top:0;z-index:10;background:var(--card);border-bottom:1px solid var(--bd);padding:12px 16px;display:flex;align-items:center;gap:10px}
/* Logo 本身即首页入口（点击回 #home）；原「规范字教学大课堂」副标题与竖线已按需求移除 */
.hd-logo{display:flex;align-items:center;flex-shrink:0;min-width:0;cursor:pointer}
.logo-img{width:118px;height:27px;object-fit:contain;display:block}
/* ---------- 顶部课程搜索（结果页为 #search/<关键词>） ---------- */
/* 搜索框不再 flex:1 撑满中段：200px 自适应基准（flex-shrink 兜底，空间不足时仍会收缩），
   两侧 auto 外边距等分剩余空白 → 搜索框在 Logo 与右侧按钮之间居中 */
.hsearch{flex:0 1 200px;min-width:0;margin:0 auto;display:flex;align-items:center;gap:6px;height:34px;padding:0 4px 0 10px;background:#f2f5fc;border:1px solid var(--bd);border-radius:18px;transition:border-color .15s,background .15s}
.hsearch:focus-within{border-color:var(--pri);background:var(--card)}
.hsearch svg{width:15px;height:15px;color:var(--tx2);flex-shrink:0}
.hsearch input{flex:1;min-width:0;height:100%;border:none;background:transparent;outline:none;font-size:13px;color:var(--tx);font-family:inherit}
.hsearch input::placeholder{color:var(--tx2)}
/* 去掉 Chrome/Safari 自带的一键清除按钮，避免与搜索按钮挤在一起 */
.hsearch input::-webkit-search-cancel-button{-webkit-appearance:none;appearance:none}
.hs-btn{flex-shrink:0;height:26px;padding:0 12px;border:none;border-radius:13px;background:var(--pri);color:#fff;font-size:12px;font-family:inherit;cursor:pointer;transition:background .15s}
.hs-btn:active{background:var(--pri-d)}
.hbtn{border:1px solid var(--pri);color:var(--pri);background:transparent;border-radius:16px;padding:4px 14px;font-size:13px;cursor:pointer;flex-shrink:0;font-family:inherit}
/* 吸右已交由 .hsearch 的两侧 auto 外边距负责（原 margin-left:auto 会让居中偏移） */
.hbtn.fill{background:var(--pri);color:#fff}
/* 窄屏：压缩 Logo 与内边距，保证搜索框仍有可输入的宽度（375px 下输入区约 90px） */
@media(max-width:430px){
  header{padding:10px 12px;gap:8px}
  .logo-img{width:100px;height:23px}
  .hsearch{padding:0 3px 0 8px;gap:5px}
  .hs-btn{padding:0 10px}
}
main{flex:1;padding:14px 14px 80px}
/* ---------- 首页 Banner 轮播（后台可配 3 张，4 秒自动切换） ---------- */
.banner{position:relative;border-radius:14px;overflow:hidden;margin:0 0 12px;aspect-ratio:3/1;background:#e8edf8;box-shadow:0 2px 10px rgba(26,58,168,.06)}
/* 非活动幻灯片必须 pointer-events:none：opacity:0 仍会拦截点击，
   三张叠放时最上层（最后一张）会吞掉所有点击，导致链接全部跳到最后一张的地址 */
.bn-slide{position:absolute;inset:0;background-size:cover;background-position:center;opacity:0;transition:opacity .5s ease;pointer-events:none}
.bn-slide.on{opacity:1;pointer-events:auto}
.bn-dots{position:absolute;left:0;right:0;bottom:8px;display:flex;justify-content:center;gap:6px;z-index:2}
.bn-dots span{width:7px;height:7px;border-radius:50%;background:rgba(255,255,255,.5);box-shadow:0 0 4px rgba(0,0,0,.25);cursor:pointer;transition:background .2s,transform .2s}
.bn-dots span.on{background:#fff;transform:scale(1.15)}
.chips{display:flex;gap:8px;overflow-x:auto;padding-bottom:10px}
.chip{white-space:nowrap;border:1px solid var(--bd);background:var(--card);border-radius:16px;padding:5px 14px;font-size:13px;cursor:pointer;color:var(--tx2)}
.chip.on{background:var(--pri);border-color:var(--pri);color:#fff}
.grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:6px}
.vcard{background:var(--card);border:1px solid var(--bd);border-radius:10px;overflow:hidden;cursor:pointer;transition:transform .15s}
.vcard:hover{transform:translateY(-2px)}
.thumb{height:96px;position:relative;overflow:hidden;background:#eef2fa}
.thumb-img{display:block;width:100%;height:100%;object-fit:cover}
.tag{position:absolute;top:6px;right:6px;background:rgba(0,0,0,.55);color:#fff;font-size:11px;padding:1px 8px;border-radius:8px}
.vinfo{padding:8px 10px}
.vinfo h4{font-size:13px;font-weight:500;line-height:1.4;max-height:36px;overflow:hidden}
.vinfo p{font-size:11px;color:var(--tx2);margin-top:4px}
.panel{background:var(--card);border:1px solid var(--bd);border-radius:12px;padding:16px;margin-top:12px}
.panel h3{font-size:15px;margin-bottom:10px;color:var(--pri-d)}
.mem-card{background:linear-gradient(120deg,var(--pri),var(--pri-d));border-radius:14px;color:#fff;padding:18px;margin-top:12px}
.mem-card .st{font-size:20px;font-weight:600}
.mem-card .ex{font-size:12px;opacity:.85;margin-top:4px}
.btn{border:none;border-radius:18px;padding:7px 18px;font-size:13px;cursor:pointer;background:var(--pri);color:#fff}
.btn.gray{background:#9aa79c}.btn.acc{background:var(--acc)}
.item{display:flex;justify-content:space-between;gap:10px;padding:10px 0;border-bottom:1px dashed var(--bd);font-size:13px}
.item:last-child{border-bottom:none}
.tabs{display:flex;border-bottom:1px solid var(--bd);background:var(--card);margin:0 -14px;padding:0 14px;overflow-x:auto}
.tabs div{padding:10px 14px;font-size:14px;cursor:pointer;color:var(--tx2);border-bottom:2px solid transparent;white-space:nowrap}
.tabs div.on{color:var(--pri);border-color:var(--pri);font-weight:600}
footer{position:fixed;bottom:0;left:50%;transform:translateX(-50%);width:100%;max-width:520px;background:var(--card);border-top:1px solid var(--bd);display:flex;z-index:10;box-shadow:0 -2px 12px rgba(26,58,168,.05)}
footer div{flex:1;text-align:center;padding:8px 0 7px;font-size:11px;color:var(--tx2);cursor:pointer;transition:color .15s}
footer div.on{color:var(--pri);font-weight:600}
footer div svg{display:block;width:21px;height:21px;margin:0 auto 2px}
.mask{position:fixed;inset:0;background:rgba(0,0,0,.45);display:flex;align-items:center;justify-content:center;z-index:99}
.modal{background:#fff;border-radius:14px;padding:22px;width:86%;max-width:360px}
.modal h3{margin-bottom:12px;color:var(--pri-d)}
.modal input{width:100%;border:1px solid var(--bd);border-radius:8px;padding:9px 12px;font-size:14px;margin:6px 0 12px}
.modal .tip{font-size:12px;color:var(--tx2);margin-top:8px}
.player{background:#000;border-radius:12px;overflow:hidden;margin-top:12px;position:relative}
.player video,.v-hero-thumb video{width:100%;display:block;background:#000;max-height:60vh}
.trial-ov{position:absolute;inset:0;background:rgba(0,0,0,.72);color:#fff;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;font-size:15px}
.back{cursor:pointer;font-size:14px;color:var(--pri);margin-top:4px;display:inline-flex;align-items:center;gap:2px}
.back svg{width:15px;height:15px}
.pill{display:inline-block;background:#ecf1fd;color:var(--pri-d);font-size:11px;border-radius:8px;padding:1px 8px;margin-right:6px}
.empty{text-align:center;color:var(--tx2);padding:30px 0;font-size:13px}
.okbox{background:#edf2fe;border:1px solid #c3d4f8;color:var(--pri-d);border-radius:10px;padding:10px 14px;font-size:13px;margin-top:10px}
code.inv{background:#ecf1fd;border-radius:6px;padding:2px 8px;color:var(--pri-d)}
.sec-title{display:flex;align-items:center;gap:7px;font-size:15px;font-weight:600;color:var(--tx);margin:18px 2px 4px}
.sec-title svg{width:17px;height:17px;color:var(--pri)}
.sec-title .cnt{font-size:11px;font-weight:400;color:var(--tx2);margin-left:auto}
/* ---------- 优惠券 ---------- */
.coupon{display:flex;align-items:stretch;background:var(--card);border:1px solid var(--bd);border-radius:12px;overflow:hidden;margin-top:8px}
.coupon.used{opacity:.5;filter:grayscale(.6)}
.coupon-l{width:96px;flex-shrink:0;background:linear-gradient(160deg,#eef2fd,#e1eafc);display:flex;flex-direction:column;align-items:center;justify-content:center;padding:12px 6px;position:relative;border-right:1px dashed #c3d0f0}
.coupon-amt{font-size:18px;font-weight:700;color:var(--pri-d);line-height:1.2}
.coupon-amt small{font-size:11px;font-weight:400}
.coupon-cond{font-size:10px;color:var(--tx2);margin-top:2px;white-space:nowrap}
.coupon-r{flex:1;padding:11px 13px;display:flex;flex-direction:column;justify-content:center;gap:3px;min-width:0}
.coupon-nm{font-size:13px;font-weight:500}
.coupon-st{font-size:11px}
.coupon-st.ok{color:var(--pri);font-weight:500}
.coupon-st.used{color:var(--tx2)}
/* ---------- 会员中心：双会员卡 ---------- */
.mcards{display:flex;flex-direction:column;gap:12px;margin-top:12px}
.mcard{position:relative;border-radius:16px;padding:16px;color:#fff;overflow:hidden;box-shadow:0 8px 22px rgba(26,58,168,.16)}
.mcard.active{background:linear-gradient(135deg,var(--pri),var(--pri-d))}
.mcard.inactive{background:linear-gradient(135deg,#8d9cc6,#69779f);box-shadow:0 6px 16px rgba(105,119,159,.2)}
.mcard::after{content:'';position:absolute;right:-38px;top:-46px;width:142px;height:142px;border-radius:50%;background:rgba(255,255,255,.08)}
.mcard::before{content:'';position:absolute;right:34px;bottom:-62px;width:112px;height:112px;border-radius:50%;background:rgba(255,255,255,.06)}
.mcard-top{display:flex;align-items:center;gap:9px;position:relative;z-index:1}
.mcard-crown{width:38px;height:38px;border-radius:50%;background:rgba(255,255,255,.18);border:1.5px solid rgba(255,255,255,.4);display:flex;align-items:center;justify-content:center;flex-shrink:0}
.mcard-crown svg{width:20px;height:20px}
.mcard-nm{font-size:16px;font-weight:700;flex:1;min-width:0}
.mcard-badge{font-size:10px;padding:2px 9px;border-radius:9px;background:rgba(255,255,255,.22);white-space:nowrap;font-weight:400}
.mcard-badge.ok{background:rgba(255,255,255,.92);color:var(--pri-d);font-weight:600}
.mcard-badge.warn{background:linear-gradient(120deg,#ffd98a,#f0b95e);color:#7a4d00;font-weight:600}
.mcard-meta{position:relative;z-index:1;margin-top:11px;font-size:12px;display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap;opacity:.92}
.mcard-meta b{font-weight:600}
.mcard-days{font-size:11px;background:rgba(255,255,255,.18);border-radius:8px;padding:1px 9px;white-space:nowrap}
.mcard-desc{position:relative;z-index:1;font-size:12px;opacity:.74;margin-top:7px;line-height:1.6}
.mcard-act{position:relative;z-index:1;margin-top:13px;display:flex;align-items:center;justify-content:space-between;gap:10px}
.mcard-price{font-size:16px;font-weight:700}
.mcard-price small{font-size:11px;font-weight:400;opacity:.72;text-decoration:line-through;margin-left:5px}
.mcard-act .btn{background:#fff;color:var(--pri-d);padding:6px 20px;font-size:13px;font-weight:600}
.mcard.lag{filter:saturate(.72)}
.mcard.off{box-shadow:0 4px 14px rgba(31,36,51,.07)}
.mcard.off .mcard-nm{color:var(--tx)}
.mcard-prog{position:relative;z-index:1;margin-top:10px;height:4px;border-radius:2px;background:rgba(255,255,255,.25);overflow:hidden}
.mcard-prog i{display:block;height:100%;border-radius:2px;background:linear-gradient(90deg,#fff5d8,#ffd166)}
.mcard-save{font-size:11px;background:rgba(255,255,255,.18);border-radius:8px;padding:1px 8px;margin-left:8px;white-space:nowrap;vertical-align:1px}
.mbenefit{display:flex;align-items:flex-start;gap:8px;background:#eef2fd;border:1px solid #c9d8f7;color:var(--pri-d);border-radius:11px;padding:11px 13px;font-size:12px;line-height:1.6;margin-top:14px}
.mbenefit svg{width:15px;height:15px;flex-shrink:0;margin-top:2px;color:var(--acc)}
.mem-chips{display:flex;flex-direction:column;gap:7px;margin-top:12px;position:relative;z-index:1}
.mem-chip{display:flex;align-items:center;gap:9px;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.14);border-radius:11px;padding:9px 12px;cursor:pointer}
.mem-chip:active{background:rgba(255,255,255,.22)}
.mem-chip .dot{width:9px;height:9px;border-radius:50%;flex-shrink:0}
.mem-chip .nm{flex:1;font-size:13px;font-weight:500;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.mem-chip .dd{font-size:12px;font-weight:600;white-space:nowrap}
/* ---------- 视频详情 ---------- */
.v-hero{position:relative;border-radius:16px;overflow:hidden;margin-top:12px;box-shadow:0 8px 22px rgba(26,58,168,.12)}
.v-hero-thumb{height:186px;display:flex;align-items:center;justify-content:center;position:relative}
/* 装饰遮罩必须让出点击：否则会整块盖住 video，原生控件（播放/音量/全屏）全部点不动 */
/* 封面可能是浅色图，压一层暗色保证播放按钮与角标始终可读 */
.v-hero-thumb::after{content:'';position:absolute;inset:0;pointer-events:none;background:linear-gradient(180deg,rgba(10,18,45,.10),rgba(10,18,45,.34)),radial-gradient(circle at 70% 20%,rgba(255,255,255,.12),transparent 55%)}
/* 进入播放态：脱离封面的固定高度与居中布局，改由 video 自身尺寸撑开 */
.v-hero-thumb.playing{height:auto;display:block;background:#000}
.v-hero-thumb.playing::after{content:none}
.v-hero-thumb.playing video{cursor:pointer}
.v-hero-thumb video::-webkit-media-controls-enclosure{border-radius:0}
.v-hero-ch{font-size:64px;font-weight:700;color:rgba(255,255,255,.9);letter-spacing:2px}
.v-bigplay{position:absolute;width:56px;height:56px;border-radius:50%;background:rgba(255,255,255,.22);border:1.5px solid rgba(255,255,255,.55);display:flex;align-items:center;justify-content:center;backdrop-filter:blur(3px)}
.v-bigplay svg{width:24px;height:24px;color:#fff;margin-left:2px}
.v-hero-tag{position:absolute;top:11px;right:11px;background:rgba(0,0,0,.38);backdrop-filter:blur(2px);color:#fff;font-size:11px;padding:2px 11px;border-radius:10px;z-index:1}
.v-title{font-size:17px;font-weight:600;line-height:1.45;margin-top:14px}
.v-meta{display:flex;flex-wrap:wrap;gap:6px;margin-top:9px}
.v-desc{background:#f6f8fd;border-radius:11px;padding:11px 13px;font-size:13px;color:var(--tx2);margin-top:12px;line-height:1.7;white-space:pre-wrap}
/* ---------- 图文详情（后台富文本渲染区）----------
   内容已在服务端经 rich_html() 白名单净化，这里只负责排版；
   图片统一 max-width:100%，防止运营插入大图撑破移动端布局。 */
.rich-content{margin-top:12px;font-size:14px;color:#3a4055;line-height:1.85;word-break:break-word;overflow-wrap:anywhere}
.rich-content p{margin:0 0 10px}
.rich-content img{max-width:100%;height:auto;border-radius:8px;display:block;margin:9px 0}
.rich-content h1,.rich-content h2,.rich-content h3,.rich-content h4,.rich-content h5{color:var(--pri-d);margin:16px 0 8px;line-height:1.45}
.rich-content h1{font-size:19px}.rich-content h2{font-size:17px}
.rich-content h3{font-size:15px}.rich-content h4,.rich-content h5{font-size:14px}
.rich-content ul,.rich-content ol{padding-left:21px;margin:8px 0}
.rich-content li{margin:4px 0}
.rich-content blockquote{border-left:3px solid var(--bd);padding:2px 0 2px 11px;color:var(--tx2);margin:10px 0}
.rich-content a{color:var(--pri);text-decoration:underline}
.rich-content table{width:100%;border-collapse:collapse;margin:10px 0;font-size:13px}
.rich-content th,.rich-content td{border:1px solid var(--bd);padding:6px 9px;text-align:left}
.rich-content th{background:#f2f5fc;font-weight:600}
.rich-content hr{border:none;border-top:1px solid var(--bd);margin:14px 0}
.rich-content pre{background:#f6f8fc;border:1px solid var(--bd);border-radius:6px;padding:10px 12px;overflow:auto;font-size:12px}
.rich-content code{background:#f2f5fc;border-radius:4px;padding:1px 5px;font-size:12.5px}
/* ---------- 资讯（公告 / 文章） ---------- */
.home-sec{margin-top:20px}
.home-sec .more{margin-left:auto;font-size:12px;color:var(--tx2);font-weight:400;cursor:pointer}
/* 首页专题区块标题：深蓝紫背景图打底，文字白/黄（assets/img/topic-head.jpg，2026-10-07） */
.sec-title.th-head{margin:20px 0 4px;padding:13px 13px;border-radius:12px;color:#fff;
  background:#4353d9 url('../img/topic-head.jpg') center/cover no-repeat;
  box-shadow:0 6px 16px rgba(58,70,180,.22)}
.sec-title.th-head .th-t{color:#fff;font-weight:700;text-shadow:0 1px 3px rgba(16,26,88,.4)}
.sec-title.th-head .more{color:#ffd894;text-shadow:0 1px 2px rgba(16,26,88,.35)}
.news-list{margin-top:10px}
.newsrow{display:flex;align-items:center;gap:9px;background:var(--card);border:1px solid var(--bd);border-radius:10px;padding:11px 13px;margin-bottom:8px;cursor:pointer}
.newsrow:active{background:#f6f8fd}
.nr-pill{flex-shrink:0;font-size:10px;color:var(--pri-d);background:#e9eefc;border-radius:7px;padding:2px 8px}
.nr-t{flex:1;min-width:0;font-size:13px;color:var(--tx);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.nr-d{flex-shrink:0;font-size:11px;color:var(--tx2)}
.newscard{display:flex;gap:12px;background:var(--card);border:1px solid var(--bd);border-radius:12px;padding:12px;margin-bottom:10px;cursor:pointer}
.newscard:active{background:#f6f8fd}
.news-cov{width:104px;height:70px;object-fit:cover;border-radius:8px;flex-shrink:0;background:#f0f3fa}
.news-info{flex:1;min-width:0;display:flex;flex-direction:column}
.news-t{font-size:14px;font-weight:600;color:var(--tx);line-height:1.45;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.news-s{font-size:12px;color:var(--tx2);margin-top:4px;line-height:1.55;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.news-m{display:flex;gap:10px;align-items:center;font-size:11px;color:var(--tx2);margin-top:auto;padding-top:6px}
.art-cover{width:100%;border-radius:11px;margin-top:12px;display:block}
.v-sec-t{display:flex;align-items:center;gap:6px;font-size:13px;font-weight:600;color:var(--tx);margin-top:15px}
.v-sec-t svg{width:15px;height:15px;color:var(--pri);flex-shrink:0}
.v-action{position:sticky;bottom:74px;margin-top:16px;z-index:5}
.v-action .btn{width:100%;padding:11px;font-size:14px;border-radius:22px;box-shadow:0 6px 16px rgba(26,58,168,.25)}
.v-action .act-row{display:flex;gap:10px}
.v-action .act-row .btn{width:auto;flex:1;padding:11px 8px}
.trial-bar{display:flex;align-items:center;gap:6px;background:#fff7e8;color:#a8620f;border:1px solid #f3d9a6;border-radius:12px;padding:7px 12px;font-size:12px;margin-bottom:8px}
.trial-bar button{margin-left:auto}
.v-action .btn.acc{box-shadow:0 6px 16px rgba(232,163,61,.35)}
.v-lock{display:flex;align-items:center;gap:8px;background:#fff8ea;border:1px solid #f3ddab;color:#9a6b12;border-radius:11px;padding:10px 13px;font-size:12px;margin-top:12px}
.v-lock svg{width:15px;height:15px;flex-shrink:0}
/* ---------- 我的页 ---------- */
.me-head{background:linear-gradient(135deg,#2f5fe0,#1a3aa8);border-radius:16px;color:#fff;padding:18px 16px 14px;margin-top:12px;box-shadow:0 8px 22px rgba(26,58,168,.18)}
.me-top{display:flex;align-items:center;gap:13px}
.avatar{width:54px;height:54px;border-radius:50%;background:rgba(255,255,255,.18);border:2px solid rgba(255,255,255,.45);display:flex;align-items:center;justify-content:center;font-size:22px;font-weight:600;flex-shrink:0}
.me-info{flex:1;min-width:0}
.me-nick{font-size:17px;font-weight:600;display:flex;align-items:center;gap:8px}
.lv-badge{font-size:10px;padding:2px 9px;border-radius:9px;background:rgba(255,255,255,.22);font-weight:400;white-space:nowrap}
.lv-badge.paid{background:linear-gradient(120deg,#ffd98a,#f0b95e);color:#7a4d00;font-weight:600}
.me-id{font-size:12px;opacity:.72;margin-top:3px}
.me-out{color:rgba(255,255,255,.8);font-size:12px;text-decoration:none;border:1px solid rgba(255,255,255,.35);border-radius:14px;padding:3px 12px;flex-shrink:0}
.me-edit{color:rgba(255,255,255,.75);font-size:11px;flex-shrink:0;align-self:center}
.me-out:active{background:rgba(255,255,255,.15)}
.me-stats{display:flex;margin-top:16px;background:rgba(255,255,255,.12);border-radius:12px;padding:11px 0}
.me-stats>div{flex:1;text-align:center;padding:0 4px}
.me-stats>div+div{border-left:1px solid rgba(255,255,255,.16)}
.me-stats b{display:block;font-size:11px;font-weight:400;opacity:.72}
.me-stats span{font-size:14px;font-weight:600;display:block;margin-top:3px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.seg{display:flex;background:#e8ecf7;border-radius:11px;padding:3px;margin:14px 0 10px}
.seg div{flex:1;text-align:center;padding:7px 0;font-size:13px;color:var(--tx2);border-radius:9px;cursor:pointer;transition:all .15s}
.seg div.on{background:var(--card);color:var(--pri);font-weight:600;box-shadow:0 2px 8px rgba(26,58,168,.1)}
.seg-panel{border-radius:12px;margin-top:0}
.o-status{font-size:11px;padding:1px 8px;border-radius:8px}
.o-1{background:#e5edfd;color:var(--pri-d)}.o-0{background:#f2f4f9;color:var(--tx2)}.o-3{background:#f6e9e7;color:var(--danger)}
.inv-box{display:flex;align-items:center;justify-content:space-between;gap:10px;background:#f4f6fb;border:1px dashed #b9c8ee;border-radius:12px;padding:12px 14px;margin-top:2px}
.inv-box code{font-size:16px;font-weight:700;letter-spacing:1px;color:var(--pri-d)}
.rate-cards{display:flex;gap:10px;margin-top:12px}
.rate-cards>div{flex:1;background:#f4f6fb;border-radius:12px;padding:11px;text-align:center}
.rate-cards b{font-size:17px;color:var(--pri-d)}
.rate-cards small{display:block;font-size:11px;color:var(--tx2);margin-top:2px}
.earn-line{display:flex;justify-content:space-between;align-items:center;margin-top:12px;font-size:13px}
.earn-line .num{font-size:18px;font-weight:700;color:var(--danger)}
/* ---------- 公告 / 页脚信息 ---------- */
.notice{display:flex;align-items:flex-start;gap:7px;background:#fff8ea;border:1px solid #f3ddab;color:#9a6b12;border-radius:10px;padding:9px 12px;font-size:12px;line-height:1.6;margin-bottom:10px}
.notice svg{width:15px;height:15px;flex-shrink:0;margin-top:2px}
.foot-info{text-align:center;color:var(--tx2);font-size:11px;line-height:1.9;margin-top:24px;padding-top:14px;border-top:1px solid var(--bd)}
.foot-info a{color:var(--pri);text-decoration:none}
.foot-links{display:flex;align-items:center;justify-content:center;gap:8px;margin:2px 0}
.foot-links i{font-style:normal;opacity:.5}
/* ---------- 用户协议 / 隐私政策 ---------- */
.policy{background:var(--card);border:1px solid var(--bd);border-radius:12px;padding:14px 16px;margin-top:8px}
.policy .pp-meta{font-size:11px;color:var(--tx2);padding-bottom:10px;margin-bottom:10px;border-bottom:1px dashed var(--bd)}
.policy p{font-size:13px;line-height:1.85;color:var(--tx);margin:0 0 8px}
.policy p.pp-h{font-weight:600;color:var(--pri-d);margin:14px 0 6px}
.policy p.pp-h:first-of-type{margin-top:0}
.policy .pp-foot{font-size:11.5px;color:var(--tx2);margin-top:14px;padding-top:10px;border-top:1px dashed var(--bd)}
/* ---------- 教材（实物商品，原「商城」） ---------- */
.gcard{display:flex;gap:12px;background:var(--card);border:1px solid var(--bd);border-radius:12px;padding:11px;margin-top:12px;cursor:pointer;transition:transform .15s,box-shadow .15s}
.gcard:active{transform:scale(.99)}
.gcover{width:90px;height:90px;border-radius:10px;flex-shrink:0;display:flex;align-items:center;justify-content:center;color:#fff;font-size:32px;font-weight:700;position:relative;overflow:hidden;background:#eef2fa}
.gcover img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;display:block}
.gcover .gt{position:absolute;top:0;left:0;background:rgba(0,0,0,.42);font-size:10px;font-weight:400;padding:1px 8px;border-radius:0 0 9px 0;z-index:1}
.ginfo{flex:1;min-width:0;display:flex;flex-direction:column}
.gname{font-size:14px;font-weight:600;line-height:1.4}
.gspec{font-size:11px;color:var(--tx2);margin-top:3px}
.gdesc{font-size:11px;color:var(--tx2);margin-top:4px;line-height:1.55;max-height:34px;overflow:hidden}
.gfoot{display:flex;align-items:flex-end;justify-content:space-between;gap:8px;margin-top:auto;padding-top:7px}
.gprice{font-size:17px;font-weight:700;color:var(--danger);line-height:1.2}
.gprice small{font-size:11px;font-weight:400;color:var(--tx2);text-decoration:line-through;margin-left:5px}
.gmember{display:inline-block;font-size:10px;background:linear-gradient(120deg,#ffd98a,#f0b95e);color:#7a4d00;border-radius:7px;padding:1px 7px;font-weight:600;margin-left:6px;vertical-align:2px}
.gsold{font-size:11px;color:var(--tx2);margin-top:5px}
.gbuy{border:none;border-radius:15px;padding:6px 16px;font-size:12px;background:var(--pri);color:#fff;cursor:pointer;flex-shrink:0}
.ship-note{display:flex;align-items:center;gap:7px;background:#eef2fd;border:1px solid #c9d8f7;color:var(--pri-d);border-radius:10px;padding:9px 12px;font-size:12px;margin-top:12px}
.ship-note svg{width:15px;height:15px;flex-shrink:0}
/* ---------- 商品详情 ---------- */
.gd-hero{height:186px;border-radius:16px;display:flex;align-items:center;justify-content:center;color:#fff;font-size:72px;font-weight:700;margin-top:12px;position:relative;overflow:hidden;background:#eef2fa;box-shadow:0 8px 22px rgba(26,58,168,.12)}
.gd-hero img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;display:block}
.gd-hero .gt{position:absolute;top:12px;left:12px;background:rgba(0,0,0,.4);font-size:11px;font-weight:400;padding:2px 11px;border-radius:10px;z-index:1}
.gd-price{display:flex;align-items:baseline;gap:8px;margin-top:14px}
.gd-price b{font-size:26px;color:var(--danger);font-weight:700}
.gd-price s{font-size:13px;color:var(--tx2)}
.gd-save{font-size:11px;background:#fdece8;color:var(--danger);border-radius:8px;padding:2px 9px}
/* ---------- 下单 / 地址 ---------- */
.co-row{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:11px 0;border-bottom:1px dashed var(--bd);font-size:13px}
.co-row:last-child{border-bottom:none}
.co-row .lbl{color:var(--tx2);flex-shrink:0}
.co-addr{display:flex;align-items:flex-start;gap:10px;padding:2px 0;cursor:pointer}
.co-addr .ico{width:30px;height:30px;border-radius:50%;background:#eef2fd;color:var(--pri);display:flex;align-items:center;justify-content:center;flex-shrink:0;margin-top:2px}
.co-addr .ico svg{width:16px;height:16px}
.co-empty-addr{display:flex;align-items:center;justify-content:space-between;gap:10px;border:1px dashed #b9c8ee;background:#f7f9fe;border-radius:11px;padding:13px;font-size:13px;color:var(--pri);cursor:pointer}
.qty{display:flex;align-items:center;gap:0;border:1px solid var(--bd);border-radius:9px;overflow:hidden;flex-shrink:0}
.qty b{width:34px;height:28px;display:flex;align-items:center;justify-content:center;font-size:15px;font-weight:400;background:#f4f6fb;cursor:pointer;user-select:none;color:var(--pri)}
.qty span{width:42px;text-align:center;font-size:13px;font-weight:600}
.co-total{display:flex;align-items:center;justify-content:space-between;padding:14px 0 4px;font-size:13px}
.co-total b{font-size:22px;color:var(--danger)}
.sub-btn{width:100%;padding:13px;font-size:15px;border-radius:24px;margin-top:12px;box-shadow:0 6px 16px rgba(26,58,168,.25)}
.addr-card{background:var(--card);border:1px solid var(--bd);border-radius:12px;padding:13px;margin-top:11px;cursor:pointer}
.addr-card.on{border-color:var(--pri);background:#f7f9fe}
.addr-top{display:flex;align-items:center;gap:10px}
.addr-nm{font-size:14px;font-weight:600}
.addr-ph{font-size:12px;color:var(--tx2)}
.addr-txt{font-size:12px;color:var(--tx2);margin-top:6px;line-height:1.6}
.addr-tag{font-size:10px;background:var(--pri);color:#fff;border-radius:7px;padding:1px 7px}
.addr-acts{display:flex;gap:8px;margin-top:10px;padding-top:10px;border-top:1px dashed var(--bd)}
.addr-acts button{flex:1;border:1px solid var(--bd);background:#fff;border-radius:8px;padding:6px;font-size:12px;cursor:pointer;color:var(--tx2)}
.addr-acts button.pri{color:var(--pri);border-color:#c3d4f8;background:#f4f7fe}
.addr-acts button.del{color:var(--danger);border-color:#f2d4d0}
/* ---------- 订单卡 ---------- */
.oc{background:var(--card);border:1px solid var(--bd);border-radius:12px;padding:13px;margin-top:11px}
.oc-top{display:flex;align-items:center;justify-content:space-between;gap:10px;font-size:11px;color:var(--tx2)}
.oc-title{font-size:14px;font-weight:600;margin-top:8px;line-height:1.45}
.oc-items{margin-top:8px;background:#f7f9fd;border-radius:9px;padding:9px 11px;font-size:12px;color:var(--tx2)}
.oc-items div{display:flex;justify-content:space-between;gap:10px;line-height:1.9}
.oc-items div+div{border-top:1px dashed var(--bd)}
.oc-ship{display:flex;align-items:center;gap:7px;margin-top:9px;font-size:12px;color:#9a6b12;background:#fff8ea;border-radius:9px;padding:8px 11px}
.oc-ship.ok{color:var(--pri-d);background:#eef2fd}
.oc-ship svg{width:14px;height:14px;flex-shrink:0}
.oc-foot{display:flex;align-items:center;justify-content:space-between;margin-top:10px;padding-top:9px;border-top:1px dashed var(--bd);font-size:12px;color:var(--tx2)}
.oc-foot b{font-size:17px;color:var(--danger)}
.fpills{display:flex;gap:7px;margin-bottom:2px}
.fpill{font-size:12px;border:1px solid var(--bd);background:var(--card);border-radius:14px;padding:4px 14px;color:var(--tx2);cursor:pointer}
.fpill.on{background:var(--pri);border-color:var(--pri);color:#fff}
.link-row{display:flex;align-items:center;justify-content:space-between;background:var(--card);border:1px solid var(--bd);border-radius:12px;padding:12px 14px;margin-top:12px;font-size:13px;cursor:pointer}
.link-row span.a{color:var(--tx2);display:flex;align-items:center;gap:7px}
.link-row svg{width:15px;height:15px;color:var(--pri)}
/* ---------- 表单 ---------- */
.fld{margin-top:11px}
.fld label{display:block;font-size:12px;color:var(--tx2);margin-bottom:4px}
.fld input,.fld textarea,.fld select{width:100%;border:1px solid var(--bd);border-radius:9px;padding:9px 12px;font-size:14px;font-family:inherit;background:#fff}
.fld textarea{resize:vertical;line-height:1.6}
.fld .row2{display:flex;gap:9px}
.fld .row2>div{flex:1;min-width:0}

/* ---------- 首页「专题问答」区块（位置：课程列表之后、课堂资讯之前） ----------
   把专题里最靠前的几条问题直接铺在首页：点任意一条进入专题详情并自动展开该条，
   比只放一张「专题入口卡」更容易让人点进去。 */
.th-badge{flex-shrink:0;font-size:10px;font-weight:700;color:#3a2606;letter-spacing:1.2px;
  background:linear-gradient(135deg,#ffd894,#e8a33d);border-radius:7px;padding:2px 8px}
.th-t{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.th-list{margin-top:10px}
.th-row{display:flex;align-items:center;gap:10px;background:var(--card);border:1px solid var(--bd);
  border-radius:11px;padding:12px 13px;margin-bottom:8px;cursor:pointer}
.th-row:active{background:#f6f8fd}
.th-no{flex-shrink:0;width:24px;height:24px;border-radius:8px;background:#eef2fd;color:#16337e;
  font-size:11.5px;font-weight:700;display:flex;align-items:center;justify-content:center}
.th-q{flex:1;min-width:0;font-size:13.8px;color:var(--tx);line-height:1.5;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.th-v{flex-shrink:0;width:20px;height:20px;border-radius:50%;background:#eaf0ff;color:#2f5fe0;
  display:flex;align-items:center;justify-content:center}
.th-v svg{width:9px;height:9px;margin-left:1px}
.th-ar{flex-shrink:0;color:#c2cadb;font-size:17px;font-weight:600;line-height:1}
.th-foot{margin-top:2px;padding:10px;text-align:center;font-size:12px;font-weight:600;color:var(--pri);
  background:var(--card);border:1px dashed #cfd9f0;border-radius:11px;cursor:pointer}
.th-foot:active{background:#f7f9fe}

/* ---------- 专题页（问答式：一条问题 ↔ 一段视频解答） ---------- */
.tp-hero{border-radius:14px;overflow:hidden;margin-bottom:12px;background:#e8edf8;box-shadow:0 2px 10px rgba(26,58,168,.06)}
.tp-cover{display:block;width:100%;aspect-ratio:3/1;object-fit:cover}
.tp-head{background:var(--card);border:1px solid var(--bd);border-radius:12px;padding:14px 15px;margin-bottom:10px}
.tp-badge{display:inline-block;font-size:10px;font-weight:700;color:#3a2606;background:linear-gradient(135deg,#ffd894,#e8a33d);border-radius:7px;padding:2px 9px;letter-spacing:1.5px}
.tp-title{font-size:19px;font-weight:700;color:#16337e;line-height:1.42;margin:8px 0 4px}
.tp-sub{font-size:13px;color:var(--tx2);line-height:1.6}
.tp-meta{margin-top:9px;padding-top:9px;border-top:1px dashed var(--bd);font-size:11.5px;color:#9aa3ba}
.tp-intro{background:var(--card);border:1px solid var(--bd);border-left:3px solid var(--acc);border-radius:10px;
  padding:12px 14px;margin-bottom:14px;font-size:13px;color:var(--tx2);line-height:1.75}
.tp-intro p{margin:0 0 6px}
.tp-intro p:last-child{margin-bottom:0}
.tp-intro b,.tp-intro strong{color:#16337e}

/* 多专题入口（列表卡片） */
.tp-cell{display:flex;gap:11px;align-items:center;background:var(--card);border:1px solid var(--bd);border-radius:12px;
  padding:11px;margin-bottom:10px;cursor:pointer}
.tp-cell:active{background:#f7f9fe}
.tp-cell-img{width:104px;height:62px;flex-shrink:0;border-radius:8px;object-fit:cover;background:#eef2fa}
.tp-cell-b{flex:1;min-width:0}
.tp-cell-t{font-size:14.5px;font-weight:700;color:var(--tx);line-height:1.4}
.tp-cell-s{font-size:11.5px;color:var(--tx2);margin-top:3px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.tp-cell-m{font-size:11px;color:var(--pri);margin-top:5px;font-weight:600}

/* 问答卡片 */
.qa-card{background:var(--card);border:1px solid var(--bd);border-radius:12px;margin-bottom:10px;overflow:hidden;
  transition:border-color .2s,box-shadow .2s}
.qa-card.open{border-color:#c6d4f6;box-shadow:0 5px 18px rgba(26,58,168,.1)}
.qa-head{display:flex;align-items:flex-start;gap:11px;padding:13px 13px 12px;cursor:pointer}
.qa-head:active{background:#f7f9fe}
.qa-no{flex-shrink:0;width:26px;height:26px;border-radius:8px;background:#eef2fd;color:#16337e;
  font-size:12px;font-weight:700;display:flex;align-items:center;justify-content:center}
.qa-card.open .qa-no{background:linear-gradient(135deg,#e8a33d,#d98c1f);color:#fff}
.qa-main{flex:1;min-width:0}
.qa-q{font-size:14.8px;font-weight:600;color:var(--tx);line-height:1.5}
.qa-meta{display:flex;align-items:center;gap:6px;margin-top:7px}
.qa-tag{font-size:10px;border-radius:6px;padding:2px 7px;background:#fff3df;color:#a9741a}
.qa-tag.v{background:#eaf0ff;color:#2f5fe0}
.qa-arrow{flex-shrink:0;color:#b9c2d6;font-size:19px;line-height:26px;font-weight:600;transition:transform .2s,color .2s}
.qa-card.open .qa-arrow{transform:rotate(90deg);color:var(--pri)}
.qa-body{display:none;padding:0 13px 13px}
.qa-card.open .qa-body{display:block;animation:qaIn .22s ease}
@keyframes qaIn{from{opacity:0;transform:translateY(-5px)}to{opacity:1;transform:none}}

/* 解答视频区：无封面图，用品牌渐变 + 田字格水印做「点击播放」挡板；
   点击后才挂载 <video>（省流量，也避免一次性拉取多条视频元数据） */
.qa-video{border-radius:10px;overflow:hidden;background:#0d1730;margin-bottom:10px}
.qa-video.playing{background:#000}
.qv-poster{position:relative;cursor:pointer;aspect-ratio:16/9;display:flex;align-items:center;justify-content:center;
  background:radial-gradient(circle at 50% 40%,#2c4ea6 0%,#182c68 58%,#0d1730 100%)}
.qv-poster::before{content:'';position:absolute;inset:0;opacity:.13;
  background:url('/assets/img/topic-mark.svg') center/34% no-repeat}
.qv-play{position:relative;z-index:1;width:54px;height:54px;border-radius:50%;
  background:rgba(255,255,255,.95);color:#1a3aa8;display:flex;align-items:center;justify-content:center;
  box-shadow:0 6px 20px rgba(0,0,0,.32);transition:transform .15s}
.qv-poster:active .qv-play{transform:scale(.94)}
.qv-play svg{width:22px;height:22px;margin-left:3px}
.qv-badge{position:absolute;z-index:1;left:9px;top:9px;font-size:10.5px;color:#fff;letter-spacing:.3px;
  background:rgba(255,255,255,.16);border-radius:7px;padding:2px 8px}
.qv-tip{position:absolute;z-index:1;left:0;right:0;bottom:11px;text-align:center;font-size:11px;color:rgba(255,255,255,.72)}
.qa-video video{display:block;width:100%;aspect-ratio:16/9;background:#000}
.qv-err{padding:10px 14px;font-size:12px;color:#ffb4ab;background:#2a1410;text-align:center}
.qv-none{padding:22px 14px;text-align:center;color:#94a3c4;font-size:12px;background:#f7f9fe}
.qv-none svg{width:17px;height:17px;display:block;margin:0 auto 6px;opacity:.7}
.qa-ans{font-size:13.8px;color:var(--tx);line-height:1.78}
.qa-ans p{margin:0 0 8px}
.qa-ans p:last-child{margin-bottom:0}
.qa-ans img{max-width:100%;border-radius:8px}

/* ---------- 播放器：进度预览帧条（雪碧图切片）
   数据来自上传视频时自动抽帧生成的预览图（videos.preview_sprite + preview_meta）。
   三个位置要用到它：课程播放页、专题页每条解答视频。都挂在 video 之后、同为深色底。 */
.pv-wrap{position:relative;background:#0d1730;padding:7px 0 5px}
.pv-strip{display:flex;gap:4px;overflow-x:auto;padding:0 8px 4px;scrollbar-width:thin}
.pv-strip::-webkit-scrollbar{height:5px}
.pv-strip::-webkit-scrollbar-thumb{background:rgba(255,255,255,.26);border-radius:3px}
.pv-strip::-webkit-scrollbar-track{background:transparent}
.pv-i{flex:0 0 auto;border-radius:4px;background-repeat:no-repeat;opacity:.58;cursor:pointer;
  border:1.5px solid transparent;transition:opacity .15s ease,border-color .15s ease}
.pv-i:hover{opacity:1}
/* 当前播放位置对应的那一帧：金色描边，扫一眼就知道播到哪了 */
.pv-i.on{opacity:1;border-color:#ffd894}
.pv-zoom{position:absolute;bottom:100%;left:0;transform:translateX(-50%);display:none;pointer-events:none;z-index:3;
  background:#000;border:1px solid rgba(255,255,255,.22);border-radius:6px;overflow:hidden;box-shadow:0 6px 20px rgba(0,0,0,.5)}
.pv-zoom.on{display:block}
.pz-i{background-repeat:no-repeat}
.pz-t{display:block;text-align:center;font-size:11px;color:#fff;background:rgba(0,0,0,.75);padding:2px 0}
.pv-cap{padding:1px 10px 0;font-size:11px;color:rgba(255,255,255,.5)}
/* 专题卡片里的帧条：贴着圆角，不留深色外框 */
.qa-video .pv-wrap{background:#0d1730}